Remove useless settings.reg_type from phaserec_MBA

There is no reason to ever use anything other than the default reg_type='mba'.

functions/phaseRetrieval/directContrast/phaserec_mba.m

@@ -20,8 +20,6 @@ function phase = phaserec_mba(hologram, fresnelNumber, settings)
 % ----------------
 % reg_alpha : Default = 0.01
 %     Regularisation Parameter alpha
-% reg_type : {'none', 'mba', 'tikhonov'}, Default = 'mba'
-%     Regularisation method
 % padx : Default = 0
 %     Amount by which the hologram is symmetrically (replicate)-padded along the
 %     x-dimension before reconstruction
@@ -78,7 +76,6 @@ function phase = phaserec_mba(hologram, fresnelNumber, settings)
 defaults.padx = 0;
 defaults.pady = 0;
 defaults.reg_alpha = 0.01;
-defaults.reg_type = 'mba';
 
 if (nargin == 0)
     phase = defaults;
@@ -99,24 +96,16 @@ laplaceKernel = -fftfreqNormSq(size(hologramPadded));
 
 % make (regularized) inverse Laplace filter kernel
 if (settings.reg_alpha == 0)
-    settings.reg_method = 'none';
-end
-switch (settings.reg_type)
-    case 'none'
         % avoid division by 0
         laplaceKernel(0,0) = 1;
         filterKernel = 1 ./ (-laplaceKernel);
         % set zero frequency (singularity) to 0
         filterKernel(0,0) = 0;
-    case 'mba'
+else
         filterKernel = 1 ./ (-laplaceKernel + settings.reg_alpha);
-    case 'tikhonov'
-        filterKernel = -laplaceKernel ./ (laplaceKernel.^2 + settings.reg_alpha^2);
-    otherwise
-        error(['Invalid reg_method ' settings.reg_method])
-
 end
 
+
 % apply inversion filter kernel to reconstruct the phase
 phase = (2 * pi * fresnelNumber) * real(ifft2(fft2(hologramPadded-1).*filterKernel));